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4.---Must I finish my homework now?
---No,you ________.You can go home now.(  )
A.needn'tB.mustn'tC.shouldn'tD.can't

分析 --我现在必须完成作业吗?
--不,你不必.你现在可以回家了.

解答 答案:A.
根据No和You can go home now.可知下面为否定回答,must的含义是必须一定,其否定形式mustn't表示禁止的含义.在这里不是禁止的意思.must的否定回答一般可借助于needn'和don't have to来构成,表示不必.故选A.

点评 本题考查了情态动词的用法.注意must的用法以及它的肯否定形式.

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